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istate.F90 in branches/UKMO/dev_r5518_medusa_fix_restart/NEMOGCM/NEMO/OPA_SRC/DOM – NEMO

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source: branches/UKMO/dev_r5518_medusa_fix_restart/NEMOGCM/NEMO/OPA_SRC/DOM/istate.F90 @ 7865

Last change on this file since 7865 was 7865, checked in by marc, 7 years ago
Adding extra arguments to ZPS_HDE
File size: 27.6 KB

Rev	Line
[3]	1	MODULE istate
	2	!!======================================================================
	3	!! * MODULE istate *
	4	!! Ocean state : initial state setting
	5	!!=====================================================================
[2104]	6	!! History : OPA ! 1989-12 (P. Andrich) Original code
	7	!! 5.0 ! 1991-11 (G. Madec) rewritting
	8	!! 6.0 ! 1996-01 (G. Madec) terrain following coordinates
	9	!! 8.0 ! 2001-09 (M. Levy, M. Ben Jelloul) istate_eel
	10	!! 8.0 ! 2001-09 (M. Levy, M. Ben Jelloul) istate_uvg
	11	!! NEMO 1.0 ! 2003-08 (G. Madec, C. Talandier) F90: Free form, modules + EEL R5
	12	!! - ! 2004-05 (A. Koch-Larrouy) istate_gyre
	13	!! 2.0 ! 2006-07 (S. Masson) distributed restart using iom
	14	!! 3.3 ! 2010-10 (C. Ethe) merge TRC-TRA
[3294]	15	!! 3.4 ! 2011-04 (G. Madec) Merge of dtatem and dtasal & suppression of tb,tn/sb,sn
[508]	16	!!----------------------------------------------------------------------
[3]	17
	18	!!----------------------------------------------------------------------
	19	!! istate_init : initial state setting
	20	!! istate_tem : analytical profile for initial Temperature
	21	!! istate_sal : analytical profile for initial Salinity
	22	!! istate_eel : initial state setting of EEL R5 configuration
[93]	23	!! istate_gyre : initial state setting of GYRE configuration
[3]	24	!! istate_uvg : initial velocity in geostropic balance
	25	!!----------------------------------------------------------------------
	26	USE oce ! ocean dynamics and active tracers
	27	USE dom_oce ! ocean space and time domain
[4245]	28	USE c1d ! 1D vertical configuration
[2104]	29	USE daymod ! calendar
	30	USE eosbn2 ! eq. of state, Brunt Vaisala frequency (eos routine)
[3]	31	USE ldftra_oce ! ocean active tracers: lateral physics
	32	USE zdf_oce ! ocean vertical physics
	33	USE phycst ! physical constants
[3294]	34	USE dtatsd ! data temperature and salinity (dta_tsd routine)
[4245]	35	USE dtauvd ! data: U & V current (dta_uvd routine)
[544]	36	USE zpshde ! partial step: hor. derivative (zps_hde routine)
	37	USE eosbn2 ! equation of state (eos bn2 routine)
[593]	38	USE domvvl ! varying vertical mesh
	39	USE dynspg_oce ! pressure gradient schemes
[4370]	40	USE dynspg_flt ! filtered free surface
[3764]	41	USE sol_oce ! ocean solver variables
[4990]	42	!
	43	USE in_out_manager ! I/O manager
	44	USE iom ! I/O library
[2715]	45	USE lib_mpp ! MPP library
[3680]	46	USE restart ! restart
[3294]	47	USE wrk_nemo ! Memory allocation
	48	USE timing ! Timing
[2715]	49
[3]	50	IMPLICIT NONE
	51	PRIVATE
	52
[508]	53	PUBLIC istate_init ! routine called by step.F90
[3]	54
	55	!! * Substitutions
	56	# include "domzgr_substitute.h90"
	57	# include "vectopt_loop_substitute.h90"
	58	!!----------------------------------------------------------------------
[4990]	59	!! NEMO/OPA 3.7 , NEMO Consortium (2014)
[888]	60	!! $Id$
[2715]	61	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
[3]	62	!!----------------------------------------------------------------------
	63	CONTAINS
	64
	65	SUBROUTINE istate_init
	66	!!----------------------------------------------------------------------
	67	!! * ROUTINE istate_init *
	68	!!
[508]	69	!! ** Purpose : Initialization of the dynamics and tracer fields.
[3]	70	!!----------------------------------------------------------------------
[5163]	71	INTEGER :: ji, jj, jk ! dummy loop indices
	72	REAL(wp), POINTER, DIMENSION(:,:,:,:) :: zuvd ! U & V data workspace
[3294]	73	!!----------------------------------------------------------------------
	74	!
[4990]	75	IF( nn_timing == 1 ) CALL timing_start('istate_init')
[3294]	76	!
[3]	77
[4990]	78	IF(lwp) WRITE(numout,*) ' '
[508]	79	IF(lwp) WRITE(numout,*) 'istate_ini : Initialization of the dynamics and tracers'
	80	IF(lwp) WRITE(numout,*) '~~~~~~~~~~'
[3]	81
[3294]	82	CALL dta_tsd_init ! Initialisation of T & S input data
[4245]	83	IF( lk_c1d ) CALL dta_uvd_init ! Initialization of U & V input data
[3]	84
[5163]	85	rhd (:,:,: ) = 0._wp ; rhop (:,:,: ) = 0._wp ! set one for all to 0 at level jpk
	86	rn2b (:,:,: ) = 0._wp ; rn2 (:,:,: ) = 0._wp ! set one for all to 0 at levels 1 and jpk
	87	tsa (:,:,:,:) = 0._wp ! set one for all to 0 at level jpk
	88	rab_b(:,:,:,:) = 0._wp ; rab_n(:,:,:,:) = 0._wp ! set one for all to 0 at level jpk
[3294]	89
[15]	90	IF( ln_rstart ) THEN ! Restart from a file
[3]	91	! ! -------------------
	92	CALL rst_read ! Read the restart file
[1130]	93	CALL day_init ! model calendar (using both namelist and restart infos)
[3]	94	ELSE
	95	! ! Start from rest
	96	! ! ---------------
[1130]	97	numror = 0 ! define numror = 0 -> no restart file to read
[3]	98	neuler = 0 ! Set time-step indicator at nit000 (euler forward)
[1130]	99	CALL day_init ! model calendar (using both namelist and restart infos)
[508]	100	! ! Initialization of ocean to zero
[3294]	101	! before fields ! now fields
	102	sshb (:,:) = 0._wp ; sshn (:,:) = 0._wp
	103	ub (:,:,:) = 0._wp ; un (:,:,:) = 0._wp
	104	vb (:,:,:) = 0._wp ; vn (:,:,:) = 0._wp
	105	rotb (:,:,:) = 0._wp ; rotn (:,:,:) = 0._wp
	106	hdivb(:,:,:) = 0._wp ; hdivn(:,:,:) = 0._wp
[508]	107	!
[3]	108	IF( cp_cfg == 'eel' ) THEN
[2104]	109	CALL istate_eel ! EEL configuration : start from pre-defined U,V T-S fields
[434]	110	ELSEIF( cp_cfg == 'gyre' ) THEN
[2104]	111	CALL istate_gyre ! GYRE configuration : start from pre-defined T-S fields
[4245]	112	ELSE ! Initial T-S, U-V fields read in files
	113	IF ( ln_tsd_init ) THEN ! read 3D T and S data at nit000
	114	CALL dta_tsd( nit000, tsb )
	115	tsn(:,:,:,:) = tsb(:,:,:,:)
	116	!
	117	ELSE ! Initial T-S fields defined analytically
	118	CALL istate_t_s
	119	ENDIF
	120	IF ( ln_uvd_init .AND. lk_c1d ) THEN ! read 3D U and V data at nit000
	121	CALL wrk_alloc( jpi, jpj, jpk, 2, zuvd )
	122	CALL dta_uvd( nit000, zuvd )
	123	ub(:,:,:) = zuvd(:,:,:,1) ; un(:,:,:) = ub(:,:,:)
	124	vb(:,:,:) = zuvd(:,:,:,2) ; vn(:,:,:) = vb(:,:,:)
	125	CALL wrk_dealloc( jpi, jpj, jpk, 2, zuvd )
	126	ENDIF
[3]	127	ENDIF
[2104]	128	!
[4313]	129	CALL eos( tsb, rhd, rhop, gdept_0(:,:,:) ) ! before potential and in situ densities
[2236]	130	#if ! defined key_c1d
[5120]	131	IF( ln_zps .AND. .NOT. ln_isfcav) &
[7865]	132	& CALL zps_hde ( nit000, jpts, tsb, &
	133	& e3w_n, gdept_n, gtsu, gtsv, & ! Partial steps: before horizontal gradient
[5120]	134	& rhd, gru , grv ) ! of t, s, rd at the last ocean level
	135	IF( ln_zps .AND. ln_isfcav) &
[7865]	136	& CALL zps_hde_isf( nit000, jpts, tsb, &
	137	& e3w_n, gdept_n, gdep3w_n, &
	138	& gtsu, gtsv, & ! Partial steps for top cell (ISF)
[5120]	139	& rhd, gru , grv , aru , arv , gzu , gzv , ge3ru , ge3rv , &
	140	& gtui, gtvi, grui, grvi, arui, arvi, gzui, gzvi, ge3rui, ge3rvi ) ! of t, s, rd at the last ocean level
[2236]	141	#endif
[2148]	142	!
	143	! - ML - sshn could be modified by istate_eel, so that initialization of fse3t_b is done here
	144	IF( lk_vvl ) THEN
	145	DO jk = 1, jpk
	146	fse3t_b(:,:,jk) = fse3t_n(:,:,jk)
	147	ENDDO
	148	ENDIF
	149	!
[3]	150	ENDIF
[1438]	151	!
[2104]	152	IF( lk_agrif ) THEN ! read free surface arrays in restart file
[593]	153	IF( ln_rstart ) THEN
[3764]	154	IF( lk_dynspg_flt ) THEN ! read or initialize the following fields
	155	! ! gcx, gcxb for agrif_opa_init
	156	IF( sol_oce_alloc() > 0 ) CALL ctl_stop('agrif sol_oce_alloc: allocation of arrays failed')
	157	CALL flt_rst( nit000, 'READ' )
	158	ENDIF
	159	ENDIF ! explicit case not coded yet with AGRIF
[1200]	160	ENDIF
[508]	161	!
[4354]	162	!
	163	! Initialize "now" and "before" barotropic velocities:
	164	! Do it whatever the free surface method, these arrays
	165	! being eventually used
	166	!
	167	!
	168	un_b(:,:) = 0._wp ; vn_b(:,:) = 0._wp
	169	ub_b(:,:) = 0._wp ; vb_b(:,:) = 0._wp
	170	!
	171	DO jk = 1, jpkm1
	172	DO jj = 1, jpj
	173	DO ji = 1, jpi
	174	un_b(ji,jj) = un_b(ji,jj) + fse3u_n(ji,jj,jk) * un(ji,jj,jk) * umask(ji,jj,jk)
	175	vn_b(ji,jj) = vn_b(ji,jj) + fse3v_n(ji,jj,jk) * vn(ji,jj,jk) * vmask(ji,jj,jk)
	176	!
[4370]	177	ub_b(ji,jj) = ub_b(ji,jj) + fse3u_b(ji,jj,jk) * ub(ji,jj,jk) * umask(ji,jj,jk)
	178	vb_b(ji,jj) = vb_b(ji,jj) + fse3v_b(ji,jj,jk) * vb(ji,jj,jk) * vmask(ji,jj,jk)
[4354]	179	END DO
	180	END DO
	181	END DO
	182	!
[4370]	183	un_b(:,:) = un_b(:,:) * hur (:,:)
	184	vn_b(:,:) = vn_b(:,:) * hvr (:,:)
[4354]	185	!
[4370]	186	ub_b(:,:) = ub_b(:,:) * hur_b(:,:)
	187	vb_b(:,:) = vb_b(:,:) * hvr_b(:,:)
[4354]	188	!
	189	!
[4990]	190	IF( nn_timing == 1 ) CALL timing_stop('istate_init')
[3294]	191	!
[3]	192	END SUBROUTINE istate_init
	193
[4990]	194
[3294]	195	SUBROUTINE istate_t_s
[3]	196	!!---------------------------------------------------------------------
[3294]	197	!! * ROUTINE istate_t_s *
[3]	198	!!
	199	!! ** Purpose : Intialization of the temperature field with an
	200	!! analytical profile or a file (i.e. in EEL configuration)
	201	!!
[3294]	202	!! ** Method : - temperature: use Philander analytic profile
	203	!! - salinity : use to a constant value 35.5
[3]	204	!!
	205	!! References : Philander ???
	206	!!----------------------------------------------------------------------
[3294]	207	INTEGER :: ji, jj, jk
	208	REAL(wp) :: zsal = 35.50
[3]	209	!!----------------------------------------------------------------------
[508]	210	!
[3]	211	IF(lwp) WRITE(numout,*)
[3294]	212	IF(lwp) WRITE(numout,*) 'istate_t_s : Philander s initial temperature profile'
	213	IF(lwp) WRITE(numout,*) '~~~~~~~~~~ and constant salinity (',zsal,' psu)'
[2104]	214	!
[3]	215	DO jk = 1, jpk
[3294]	216	tsn(:,:,jk,jp_tem) = ( ( ( 7.5 - 0. * ABS( gphit(:,:) )/30. ) * ( 1.-TANH((fsdept(:,:,jk)-80.)/30.) ) &
	217	& + 10. * ( 5000. - fsdept(:,:,jk) ) /5000.) ) * tmask(:,:,jk)
	218	tsb(:,:,jk,jp_tem) = tsn(:,:,jk,jp_tem)
[3]	219	END DO
[3294]	220	tsn(:,:,:,jp_sal) = zsal * tmask(:,:,:)
	221	tsb(:,:,:,jp_sal) = tsn(:,:,:,jp_sal)
[2104]	222	!
[3294]	223	END SUBROUTINE istate_t_s
[3]	224
[4990]	225
[3]	226	SUBROUTINE istate_eel
	227	!!----------------------------------------------------------------------
	228	!! * ROUTINE istate_eel *
	229	!!
	230	!! ** Purpose : Initialization of the dynamics and tracers for EEL R5
	231	!! configuration (channel with or without a topographic bump)
	232	!!
	233	!! ** Method : - set temprature field
	234	!! - set salinity field
	235	!! - set velocity field including horizontal divergence
	236	!! and relative vorticity fields
	237	!!----------------------------------------------------------------------
	238	USE divcur ! hor. divergence & rel. vorticity (div_cur routine)
[473]	239	USE iom
[4990]	240	!
[3]	241	INTEGER :: inum ! temporary logical unit
	242	INTEGER :: ji, jj, jk ! dummy loop indices
[479]	243	INTEGER :: ijloc
[508]	244	REAL(wp) :: zh1, zh2, zslope, zcst, zfcor ! temporary scalars
[2104]	245	REAL(wp) :: zt1 = 15._wp ! surface temperature value (EEL R5)
	246	REAL(wp) :: zt2 = 5._wp ! bottom temperature value (EEL R5)
	247	REAL(wp) :: zsal = 35.0_wp ! constant salinity (EEL R2, R5 and R6)
	248	REAL(wp) :: zueel = 0.1_wp ! constant uniform zonal velocity (EEL R5)
[508]	249	REAL(wp), DIMENSION(jpiglo,jpjglo) :: zssh ! initial ssh over the global domain
[3]	250	!!----------------------------------------------------------------------
[4990]	251	!
[3]	252	SELECT CASE ( jp_cfg )
	253	! ! ====================
	254	CASE ( 5 ) ! EEL R5 configuration
	255	! ! ====================
[2104]	256	!
[3]	257	! set temperature field with a linear profile
	258	! -------------------------------------------
	259	IF(lwp) WRITE(numout,*)
	260	IF(lwp) WRITE(numout,*) 'istate_eel : EEL R5: linear temperature profile'
	261	IF(lwp) WRITE(numout,*) '~~~~~~~~~~'
[2104]	262	!
[4292]	263	zh1 = gdept_1d( 1 )
	264	zh2 = gdept_1d(jpkm1)
[2104]	265	!
[3]	266	zslope = ( zt1 - zt2 ) / ( zh1 - zh2 )
	267	zcst = ( zt1 * ( zh1 - zh2) - ( zt1 - zt2 ) * zh1 ) / ( zh1 - zh2 )
[2104]	268	!
[3]	269	DO jk = 1, jpk
[3294]	270	tsn(:,:,jk,jp_tem) = ( zt2 + zt1 * exp( - fsdept(:,:,jk) / 1000 ) ) * tmask(:,:,jk)
	271	tsb(:,:,jk,jp_tem) = tsn(:,:,jk,jp_tem)
[3]	272	END DO
[2104]	273	!
[3294]	274	IF(lwp) CALL prizre( tsn(:,:,:,jp_tem), jpi , jpj , jpk , jpj/2 , &
	275	& 1 , jpi , 5 , 1 , jpk , &
	276	& 1 , 1. , numout )
[2104]	277	!
[3]	278	! set salinity field to a constant value
	279	! --------------------------------------
	280	IF(lwp) WRITE(numout,*)
	281	IF(lwp) WRITE(numout,*) 'istate_eel : EEL R5: constant salinity field, S = ', zsal
	282	IF(lwp) WRITE(numout,*) '~~~~~~~~~~'
[2104]	283	!
[3294]	284	tsn(:,:,:,jp_sal) = zsal * tmask(:,:,:)
	285	tsb(:,:,:,jp_sal) = tsn(:,:,:,jp_sal)
[2104]	286	!
[3]	287	! set the dynamics: U,V, hdiv, rot (and ssh if necessary)
	288	! ----------------
	289	! Start EEL5 configuration with barotropic geostrophic velocities
	290	! according the sshb and sshn SSH imposed.
[479]	291	! we assume a uniform grid (hence the use of e1t(1,1) for delta_y)
	292	! we use the Coriolis frequency at mid-channel.
	293	ub(:,:,:) = zueel * umask(:,:,:)
[3]	294	un(:,:,:) = ub(:,:,:)
[479]	295	ijloc = mj0(INT(jpjglo-1)/2)
	296	zfcor = ff(1,ijloc)
[2104]	297	!
[3]	298	DO jj = 1, jpjglo
[479]	299	zssh(:,jj) = - (FLOAT(jj)- FLOAT(jpjglo-1)/2.)zueele1t(1,1)*zfcor/grav
[3]	300	END DO
[2104]	301	!
[479]	302	IF(lwp) THEN
	303	WRITE(numout,*) ' Uniform zonal velocity for EEL R5:',zueel
	304	WRITE(numout,*) ' Geostrophic SSH profile as a function of y:'
	305	WRITE(numout,'(12(1x,f6.2))') zssh(1,:)
	306	ENDIF
[2104]	307	!
[3]	308	DO jj = 1, nlcj
	309	DO ji = 1, nlci
	310	sshb(ji,jj) = zssh( mig(ji) , mjg(jj) ) * tmask(ji,jj,1)
	311	END DO
	312	END DO
	313	sshb(nlci+1:jpi, : ) = 0.e0 ! set to zero extra mpp columns
	314	sshb( : ,nlcj+1:jpj) = 0.e0 ! set to zero extra mpp rows
[2104]	315	!
[3]	316	sshn(:,:) = sshb(:,:) ! set now ssh to the before value
[2104]	317	!
[593]	318	IF( nn_rstssh /= 0 ) THEN
[2104]	319	nn_rstssh = 0 ! hand-made initilization of ssh
[593]	320	CALL ctl_warn( 'istate_eel: force nn_rstssh = 0' )
[558]	321	ENDIF
[2104]	322	!
	323	CALL div_cur( nit000 ) ! horizontal divergence and relative vorticity (curl)
[3]	324	! N.B. the vertical velocity will be computed from the horizontal divergence field
	325	! in istate by a call to wzv routine
	326
	327
	328	! ! ==========================
	329	CASE ( 2 , 6 ) ! EEL R2 or R6 configuration
	330	! ! ==========================
[2104]	331	!
[3]	332	! set temperature field with a NetCDF file
	333	! ----------------------------------------
	334	IF(lwp) WRITE(numout,*)
	335	IF(lwp) WRITE(numout,*) 'istate_eel : EEL R2 or R6: read initial temperature in a NetCDF file'
	336	IF(lwp) WRITE(numout,*) '~~~~~~~~~~'
[2104]	337	!
[473]	338	CALL iom_open ( 'eel.initemp', inum )
[3294]	339	CALL iom_get ( inum, jpdom_data, 'initemp', tsb(:,:,:,jp_tem) ) ! read before temprature (tb)
[473]	340	CALL iom_close( inum )
[2104]	341	!
[3294]	342	tsn(:,:,:,jp_tem) = tsb(:,:,:,jp_tem) ! set nox temperature to tb
[2104]	343	!
[3294]	344	IF(lwp) CALL prizre( tsn(:,:,:,jp_tem), jpi , jpj , jpk , jpj/2 , &
	345	& 1 , jpi , 5 , 1 , jpk , &
	346	& 1 , 1. , numout )
[2104]	347	!
[3]	348	! set salinity field to a constant value
	349	! --------------------------------------
	350	IF(lwp) WRITE(numout,*)
	351	IF(lwp) WRITE(numout,*) 'istate_eel : EEL R5: constant salinity field, S = ', zsal
	352	IF(lwp) WRITE(numout,*) '~~~~~~~~~~'
[2104]	353	!
[3294]	354	tsn(:,:,:,jp_sal) = zsal * tmask(:,:,:)
	355	tsb(:,:,:,jp_sal) = tsn(:,:,:,jp_sal)
[2104]	356	!
[3]	357	! ! ===========================
	358	CASE DEFAULT ! NONE existing configuration
	359	! ! ===========================
[473]	360	WRITE(ctmp1,*) 'EEL with a ', jp_cfg,' km resolution is not coded'
	361	CALL ctl_stop( ctmp1 )
[2104]	362	!
[3]	363	END SELECT
[2104]	364	!
[3]	365	END SUBROUTINE istate_eel
	366
	367
[93]	368	SUBROUTINE istate_gyre
	369	!!----------------------------------------------------------------------
	370	!! * ROUTINE istate_gyre *
	371	!!
	372	!! ** Purpose : Initialization of the dynamics and tracers for GYRE
	373	!! configuration (double gyre with rotated domain)
	374	!!
	375	!! ** Method : - set temprature field
	376	!! - set salinity field
	377	!!----------------------------------------------------------------------
[473]	378	INTEGER :: ji, jj, jk ! dummy loop indices
[508]	379	INTEGER :: inum ! temporary logical unit
	380	INTEGER, PARAMETER :: ntsinit = 0 ! (0/1) (analytical/input data files) T&S initialization
[93]	381	!!----------------------------------------------------------------------
[4990]	382	!
[434]	383	SELECT CASE ( ntsinit)
[4990]	384	!
[434]	385	CASE ( 0 ) ! analytical T/S profil deduced from LEVITUS
	386	IF(lwp) WRITE(numout,*)
	387	IF(lwp) WRITE(numout,*) 'istate_gyre : initial analytical T and S profil deduced from LEVITUS '
	388	IF(lwp) WRITE(numout,*) '~~~~~~~~~~~'
[4990]	389	!
[434]	390	DO jk = 1, jpk
	391	DO jj = 1, jpj
	392	DO ji = 1, jpi
[3294]	393	tsn(ji,jj,jk,jp_tem) = ( 16. - 12. * TANH( (fsdept(ji,jj,jk) - 400) / 700 ) ) &
[434]	394	& * (-TANH( (500-fsdept(ji,jj,jk)) / 150 ) + 1) / 2 &
	395	& + ( 15. * ( 1. - TANH( (fsdept(ji,jj,jk)-50.) / 1500.) ) &
	396	& - 1.4 * TANH((fsdept(ji,jj,jk)-100.) / 100.) &
	397	& + 7. * (1500. - fsdept(ji,jj,jk)) / 1500. ) &
	398	& * (-TANH( (fsdept(ji,jj,jk) - 500) / 150) + 1) / 2
[3294]	399	tsn(ji,jj,jk,jp_tem) = tsn(ji,jj,jk,jp_tem) * tmask(ji,jj,jk)
	400	tsb(ji,jj,jk,jp_tem) = tsn(ji,jj,jk,jp_tem)
[434]	401
[3294]	402	tsn(ji,jj,jk,jp_sal) = ( 36.25 - 1.13 * TANH( (fsdept(ji,jj,jk) - 305) / 460 ) ) &
[434]	403	& * (-TANH((500 - fsdept(ji,jj,jk)) / 150) + 1) / 2 &
	404	& + ( 35.55 + 1.25 * (5000. - fsdept(ji,jj,jk)) / 5000. &
	405	& - 1.62 * TANH( (fsdept(ji,jj,jk) - 60. ) / 650. ) &
	406	& + 0.2 * TANH( (fsdept(ji,jj,jk) - 35. ) / 100. ) &
	407	& + 0.2 * TANH( (fsdept(ji,jj,jk) - 1000.) / 5000.) ) &
	408	& * (-TANH((fsdept(ji,jj,jk) - 500) / 150) + 1) / 2
[3294]	409	tsn(ji,jj,jk,jp_sal) = tsn(ji,jj,jk,jp_sal) * tmask(ji,jj,jk)
	410	tsb(ji,jj,jk,jp_sal) = tsn(ji,jj,jk,jp_sal)
[434]	411	END DO
[93]	412	END DO
	413	END DO
[4990]	414	!
[434]	415	CASE ( 1 ) ! T/S data fields read in dta_tem.nc/data_sal.nc files
	416	IF(lwp) WRITE(numout,*)
	417	IF(lwp) WRITE(numout,*) 'istate_gyre : initial T and S read from dta_tem.nc/data_sal.nc files'
	418	IF(lwp) WRITE(numout,*) '~~~~~~~~~~~'
	419	IF(lwp) WRITE(numout,*) ' NetCDF FORMAT'
	420
	421	! Read temperature field
	422	! ----------------------
[473]	423	CALL iom_open ( 'data_tem', inum )
[3294]	424	CALL iom_get ( inum, jpdom_data, 'votemper', tsn(:,:,:,jp_tem) )
[473]	425	CALL iom_close( inum )
[434]	426
[3294]	427	tsn(:,:,:,jp_tem) = tsn(:,:,:,jp_tem) * tmask(:,:,:)
	428	tsb(:,:,:,jp_tem) = tsn(:,:,:,jp_tem)
[434]	429
	430	! Read salinity field
	431	! -------------------
[473]	432	CALL iom_open ( 'data_sal', inum )
[3294]	433	CALL iom_get ( inum, jpdom_data, 'vosaline', tsn(:,:,:,jp_sal) )
[473]	434	CALL iom_close( inum )
[434]	435
[3294]	436	tsn(:,:,:,jp_sal) = tsn(:,:,:,jp_sal) * tmask(:,:,:)
	437	tsb(:,:,:,jp_sal) = tsn(:,:,:,jp_sal)
[4990]	438	!
[434]	439	END SELECT
[4990]	440	!
[93]	441	IF(lwp) THEN
	442	WRITE(numout,*)
	443	WRITE(numout,*) ' Initial temperature and salinity profiles:'
[4292]	444	WRITE(numout, "(9x,' level gdept_1d temperature salinity ')" )
	445	WRITE(numout, "(10x, i4, 3f10.2)" ) ( jk, gdept_1d(jk), tsn(2,2,jk,jp_tem), tsn(2,2,jk,jp_sal), jk = 1, jpk )
[93]	446	ENDIF
[4990]	447	!
[93]	448	END SUBROUTINE istate_gyre
	449
[4990]	450
[3]	451	SUBROUTINE istate_uvg
	452	!!----------------------------------------------------------------------
	453	!! * ROUTINE istate_uvg *
	454	!!
	455	!! ** Purpose : Compute the geostrophic velocities from (tn,sn) fields
	456	!!
	457	!! ** Method : Using the hydrostatic hypothesis the now hydrostatic
	458	!! pressure is computed by integrating the in-situ density from the
	459	!! surface to the bottom.
	460	!! p=integral [ rau*g dz ]
	461	!!----------------------------------------------------------------------
[359]	462	USE dynspg ! surface pressure gradient (dyn_spg routine)
[3]	463	USE divcur ! hor. divergence & rel. vorticity (div_cur routine)
	464	USE lbclnk ! ocean lateral boundary condition (or mpp link)
[4990]	465	!
[3]	466	INTEGER :: ji, jj, jk ! dummy loop indices
	467	INTEGER :: indic ! ???
[508]	468	REAL(wp) :: zmsv, zphv, zmsu, zphu, zalfg ! temporary scalars
[3294]	469	REAL(wp), POINTER, DIMENSION(:,:,:) :: zprn
[3]	470	!!----------------------------------------------------------------------
[3294]	471	!
	472	CALL wrk_alloc( jpi, jpj, jpk, zprn)
	473	!
[3]	474	IF(lwp) WRITE(numout,*)
	475	IF(lwp) WRITE(numout,*) 'istate_uvg : Start from Geostrophy'
	476	IF(lwp) WRITE(numout,*) '~~~~~~~~~~'
	477
	478	! Compute the now hydrostatic pressure
	479	! ------------------------------------
	480
[15]	481	zalfg = 0.5 * grav * rau0
[508]	482
	483	zprn(:,:,1) = zalfg * fse3w(:,:,1) * ( 1 + rhd(:,:,1) ) ! Surface value
[3]	484
[508]	485	DO jk = 2, jpkm1 ! Vertical integration from the surface
[3]	486	zprn(:,:,jk) = zprn(:,:,jk-1) &
[359]	487	& + zalfg * fse3w(:,:,jk) * ( 2. + rhd(:,:,jk) + rhd(:,:,jk-1) )
[3]	488	END DO
	489
	490	! Compute geostrophic balance
	491	! ---------------------------
	492	DO jk = 1, jpkm1
	493	DO jj = 2, jpjm1
	494	DO ji = fs_2, fs_jpim1 ! vertor opt.
	495	zmsv = 1. / MAX( umask(ji-1,jj+1,jk) + umask(ji ,jj+1,jk) &
	496	+ umask(ji-1,jj ,jk) + umask(ji ,jj ,jk) , 1. )
	497	zphv = ( zprn(ji ,jj+1,jk) - zprn(ji-1,jj+1,jk) ) * umask(ji-1,jj+1,jk) / e1u(ji-1,jj+1) &
	498	+ ( zprn(ji+1,jj+1,jk) - zprn(ji ,jj+1,jk) ) * umask(ji ,jj+1,jk) / e1u(ji ,jj+1) &
	499	+ ( zprn(ji ,jj ,jk) - zprn(ji-1,jj ,jk) ) * umask(ji-1,jj ,jk) / e1u(ji-1,jj ) &
	500	+ ( zprn(ji+1,jj ,jk) - zprn(ji ,jj ,jk) ) * umask(ji ,jj ,jk) / e1u(ji ,jj )
	501	zphv = 1. / rau0 * zphv * zmsv * vmask(ji,jj,jk)
	502
	503	zmsu = 1. / MAX( vmask(ji+1,jj ,jk) + vmask(ji ,jj ,jk) &
	504	+ vmask(ji+1,jj-1,jk) + vmask(ji ,jj-1,jk) , 1. )
	505	zphu = ( zprn(ji+1,jj+1,jk) - zprn(ji+1,jj ,jk) ) * vmask(ji+1,jj ,jk) / e2v(ji+1,jj ) &
	506	+ ( zprn(ji ,jj+1,jk) - zprn(ji ,jj ,jk) ) * vmask(ji ,jj ,jk) / e2v(ji ,jj ) &
	507	+ ( zprn(ji+1,jj ,jk) - zprn(ji+1,jj-1,jk) ) * vmask(ji+1,jj-1,jk) / e2v(ji+1,jj-1) &
	508	+ ( zprn(ji ,jj ,jk) - zprn(ji ,jj-1,jk) ) * vmask(ji ,jj-1,jk) / e2v(ji ,jj-1)
	509	zphu = 1. / rau0 * zphu * zmsu * umask(ji,jj,jk)
	510
	511	! Compute the geostrophic velocities
	512	un(ji,jj,jk) = -2. * zphu / ( ff(ji,jj) + ff(ji ,jj-1) )
	513	vn(ji,jj,jk) = 2. * zphv / ( ff(ji,jj) + ff(ji-1,jj ) )
	514	END DO
	515	END DO
	516	END DO
	517
	518	IF(lwp) WRITE(numout,*) ' we force to zero bottom velocity'
	519
	520	! Susbtract the bottom velocity (level jpk-1 for flat bottom case)
	521	! to have a zero bottom velocity
	522
	523	DO jk = 1, jpkm1
	524	un(:,:,jk) = ( un(:,:,jk) - un(:,:,jpkm1) ) * umask(:,:,jk)
	525	vn(:,:,jk) = ( vn(:,:,jk) - vn(:,:,jpkm1) ) * vmask(:,:,jk)
	526	END DO
	527
	528	CALL lbc_lnk( un, 'U', -1. )
	529	CALL lbc_lnk( vn, 'V', -1. )
	530
	531	ub(:,:,:) = un(:,:,:)
	532	vb(:,:,:) = vn(:,:,:)
	533
	534	! WARNING !!!!!
	535	! after initializing u and v, we need to calculate the initial streamfunction bsf.
	536	! Otherwise, only the trend will be computed and the model will blow up (inconsistency).
	537	! to do that, we call dyn_spg with a special trick:
[508]	538	! we fill ua and va with the velocities divided by dt, and the streamfunction will be brought to the
	539	! right value assuming the velocities have been set up in one time step.
	540	! we then set bsfd to zero (first guess for next step is d(psi)/dt = 0.)
	541	! sets up s false trend to calculate the barotropic streamfunction.
[3]	542
	543	ua(:,:,:) = ub(:,:,:) / rdt
	544	va(:,:,:) = vb(:,:,:) / rdt
	545
[359]	546	! calls dyn_spg. we assume euler time step, starting from rest.
[3]	547	indic = 0
[359]	548	CALL dyn_spg( nit000, indic ) ! surface pressure gradient
[3]	549
	550	! the new velocity is ua*rdt
	551
	552	CALL lbc_lnk( ua, 'U', -1. )
	553	CALL lbc_lnk( va, 'V', -1. )
	554
	555	ub(:,:,:) = ua(:,:,:) * rdt
	556	vb(:,:,:) = va(:,:,:) * rdt
	557	ua(:,:,:) = 0.e0
	558	va(:,:,:) = 0.e0
	559	un(:,:,:) = ub(:,:,:)
	560	vn(:,:,:) = vb(:,:,:)
	561
	562	! Compute the divergence and curl
	563
	564	CALL div_cur( nit000 ) ! now horizontal divergence and curl
	565
	566	hdivb(:,:,:) = hdivn(:,:,:) ! set the before to the now value
	567	rotb (:,:,:) = rotn (:,:,:) ! set the before to the now value
[508]	568	!
[3294]	569	CALL wrk_dealloc( jpi, jpj, jpk, zprn)
[2715]	570	!
[3]	571	END SUBROUTINE istate_uvg
	572
	573	!!=====================================================================
	574	END MODULE istate

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